The terrible 2's is strong with my July 2016 daughter. Holy hell.

Anyway, while she pushes the limits all the time, thats not our biggest issue- she responds fairly well to discipline and moves on from tantrums rather quickly.

What I can't deal with is.. She is SO mean to her little brother. She hits and kicks him, rips things out of his hands, screams at him, etc. Its awful and most of the time, completely unprovoked. He will be playing, minding his own business and she will walk up and step on him. WTF!? This has been going on for months and I don't know what to do. No amount of discipline, reminders, or time outs seems to phase her when it comes to her brother. Hes 14months and the sweetest little boy- I feel terrible. Any thoughts? comments? advice?